Optics & Laser Technology最新文献_第8页

Corrigendum to “Lifetime thermometry in the third biological window using KMnF3:Yb/Er nanoparticles” [Opt. Laser Technol. 171 (2024) 110438] 使用 KMnF3:Yb/Er 纳米粒子进行第三生物窗口的寿命测温》的更正 [Opt.

Optics & Laser Technology Pub Date : 2024-02-19 DOI: 10.1016/j.optlastec.2024.110728

Sangeetha Balabhadra, Pratik.S. Solanki, Michael F. Reid, Jon-Paul R. Wells

引用次数: 0

Generation and observation of noise-like pulses in an ultrafast fiber laser at 1.7 μm 在 1.7 μm 的超快光纤激光器中产生和观测噪声脉冲

Optics & Laser Technology Pub Date : 2024-02-18 DOI: 10.1016/j.optlastec.2024.110715

Yatao Yang, Yubo Ji, Yuhua Xie, Yufeng Song, Ke Wang, Zhenhong Wang

引用次数: 0

Simulation of narrow generation in a Raman fiber laser with random distributed feedback 带有随机分布式反馈的拉曼光纤激光器窄波生成模拟

Optics & Laser Technology Pub Date : 2024-02-16 DOI: 10.1016/j.optlastec.2024.110677

Oleg Gorbunov, Ilya Vatnik, Sergey Smirnov, Dmitry Churkin

引用次数: 0

Rapid fabrication of quasi-periodic aspherical concave microlens array with different focal lengths on fused silica by shaping picosecond laser-induced multi-step wet-etching for multi-layer optical imaging 利用成型皮秒激光诱导多步湿蚀刻技术，在熔融石英上快速制造不同焦距的准周期非球面凹面微透镜阵列，用于多层光学成像

Optics & Laser Technology Pub Date : 2024-02-16 DOI: 10.1016/j.optlastec.2024.110688

Dejian Kong, Xiaoyan Sun, Limu Zhang, Youwang Hu, Ji-an Duan

{"title":"Rapid fabrication of quasi-periodic aspherical concave microlens array with different focal lengths on fused silica by shaping picosecond laser-induced multi-step wet-etching for multi-layer optical imaging","authors":"Dejian Kong, Xiaoyan Sun, Limu Zhang, Youwang Hu, Ji-an Duan","doi":"10.1016/j.optlastec.2024.110688","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110688","url":null,"abstract":"Fused-silica-based microlens array (MLA) with different focal lengths is a significant optical element for multi-layer optical imaging. In this paper, we propose shaping picosecond laser-induced multi-step wet-etching to control the morphology of the MLA. A spatial light modulator (SLM) was employed to shape the Gaussian picosecond laser into multiple focal spots with different focal depths. The multiple focal spots induced the ablation regions with different depths inside the fused silica. As a result, the morphologies of the MLA could be controlled from the spherical surface to the aspheric surface. The diameter, sag height, vertex curvature radius, and cone coefficient of the aspheric surface could be readily controlled by the average pulse energy and the focal depths of each focal spot. The ratio between maximum vertex focal length and minimum vertex focal length could be adjusted between 1 and 9.52. Moreover, the patterned MLAs were used for multi-layer imaging and 3D code, which can be applied in optical storage or anti-fake. We believe that shaping picosecond laser induced multi-step wet-etching is a highly efficient and flexible approach to fabricate the micro-optical elements on fused silica.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-precision optical processing technology for large-aperture laser optics: Ripple structure removal and laser damage resistance enhancement of fused silica optics 用于大孔径激光光学元件的超精密光学加工技术：熔融石英光学器件的波纹结构去除和抗激光损伤能力增强

Optics & Laser Technology Pub Date : 2024-02-16 DOI: 10.1016/j.optlastec.2024.110685

Wanli Zhang, Feng Shi, Ci Song, Ningye Ruan, Guipeng Tie, Bo Wang, Guoyan Sun, Xing Peng

{"title":"Ultra-precision optical processing technology for large-aperture laser optics: Ripple structure removal and laser damage resistance enhancement of fused silica optics","authors":"Wanli Zhang, Feng Shi, Ci Song, Ningye Ruan, Guipeng Tie, Bo Wang, Guoyan Sun, Xing Peng","doi":"10.1016/j.optlastec.2024.110685","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110685","url":null,"abstract":"In AMRF (arrayed magnetorheological finishing) process of fused silica laser optics, ripple structures would generate on the optical surface. The ripple structures could cause nonlinear self-focusing and localized energy deposition, finally induced laser damage. In this work, the removal of ripple structures and the improvement of anti-laser damage characteristics were studied. First, the heat deposition and light-field enhancement induced by ripple structures were analyzed by finite element simulation method, and the negative impact of ripple structures was clarified. Then, the ripple-structure surface was polished by a combined technique of low-stress CCOS (computer control optical surfacing) and ion beam finishing (IBF). After the combined polishing process, the ripple structures and the hydrolyzed layer on the surface were removed, the photo-thermal absorption decreased from 0.736 ppm to 0.124 ppm, and the laser induced damage threshold (LIDT) increased from 6.3 J/cm to 7.4 J/cm. In this work, the combined technique was able to remove the ripple structures while maintaining the processing efficiency, and it also could improve the anti-laser damage characteristics of the optics. The relative research results had important reference value for ultra-precision manufacturing of large-aperture laser optics.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"92 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Self-mixing rotational Doppler effect for spinning velocity detection 用于旋转速度检测的自混合旋转多普勒效应

Optics & Laser Technology Pub Date : 2024-02-16 DOI: 10.1016/j.optlastec.2024.110721

Song Qiu, Tong Liu, Zhengliang Liu, You Ding, Ruoyu Tang, Xiangyang Zhu, Ke Wang, Yuan Ren

{"title":"Self-mixing rotational Doppler effect for spinning velocity detection","authors":"Song Qiu, Tong Liu, Zhengliang Liu, You Ding, Ruoyu Tang, Xiangyang Zhu, Ke Wang, Yuan Ren","doi":"10.1016/j.optlastec.2024.110721","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110721","url":null,"abstract":"The Doppler effect is a well-known phenomenon which has been widely applied in many areas. Less well-known than the traditional linear Doppler effect, the rotational Doppler effect (RDE) which arises from the transverse motion between the wave source and the object has attracted a lot of attention in recent years. Here, we report on the demonstration of RDE in a laser self-mixing framework and provide high-sensitivity, auto-alignment rotational velocity (magnitude and direction) detection. This novel self-mixing rotational Doppler detection scheme is different from the existing rotational Doppler detection schemes, with its light source also acts as a signal amplifier. Further, in the vortex retarder-based self-mixing interferometry, we find that the feedback light experience twice the rotational Doppler shift compared to traditional RDE detection methods. At the same time, the direction of rotation can be discriminated with the help of the light frequency modulators, i.e., we can realize the detection of velocity vectors. We demonstrate the mode selection properties of the self-mixing detection framework and successfully realized the high signal-to-noise ratio measurement of the rotational speed, which is expected to greatly expand the detection capability of the RDE-based metrology in the long-range and weak signal detection conditions. This demonstration is of significance as it provides us with insight into the production of the RDE in the new regimes.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectral information acquisition enabled by a multi-aperture imaging system with high spatial resolution capability 利用具有高空间分辨率能力的多孔径成像系统获取光谱信息

Optics & Laser Technology Pub Date : 2024-02-15 DOI: 10.1016/j.optlastec.2024.110727

Wei Li, Jiali Liao, Zihao Wang, Yanling Sun, Linke Liu, Jinrong Lan

{"title":"Spectral information acquisition enabled by a multi-aperture imaging system with high spatial resolution capability","authors":"Wei Li, Jiali Liao, Zihao Wang, Yanling Sun, Linke Liu, Jinrong Lan","doi":"10.1016/j.optlastec.2024.110727","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110727","url":null,"abstract":"Multi-aperture optical telescopes have been extensively researched because they can achieve a comparable high spatial resolution as a single large filled aperture. However, the spectral information of the objects is also essential and can effectively reflect their physical and chemical characteristics. Applying the Fourier transform imaging spectroscopy (FTIS) technique, the multi-aperture imaging system can also obtain spectral information by scanning the optical path delay (OPD) between sub-apertures. Here, we propose a scheme to appropriately set up the optical path control module of the multi-aperture system, enabling the acquisition of both high spatial resolution images and spectral information within a single multi-aperture imaging system. High spatial resolution information is obtained when the sub-apertures are in phase, and spectral information is obtained when OPDs between sub-apertures are scanned. Detailed simulations have been conducted for point-like sources and extended objects. It indicates that the system can obtain non-overlapping spectral information when applying an appropriate delay rate for each sub-aperture. Moreover, it also shows that some redundant low-frequency information is resolved from the extended objects, which originates from the image degradation caused by the separated sub-apertures of the system. The FTIS experiments performed with a multi-aperture imaging system have been carried out, demonstrating the input spectral information can be recovered precisely. The proposed scheme enables the multi-aperture imaging system to obtain high spatial resolution images and spectral information, expanding its functionality while controlling its cost and complexity.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"166 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A robust color image watermarking scheme in the fusion domain based on LU factorization 基于 LU 因式分解的融合域稳健彩色图像水印方案

Optics & Laser Technology Pub Date : 2024-02-15 DOI: 10.1016/j.optlastec.2024.110726

Qingtang Su, Yehan Sun, Yu Xia, Zengfeng Wang

{"title":"A robust color image watermarking scheme in the fusion domain based on LU factorization","authors":"Qingtang Su, Yehan Sun, Yu Xia, Zengfeng Wang","doi":"10.1016/j.optlastec.2024.110726","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110726","url":null,"abstract":"Since most of the current watermarking schemes neglect the need of real time and resisting malicious geometric attacks, this paper proposes a robust color image watermarking scheme based on the deep fusion theory between spatial domain and LU factorization to overcome these problems. The color watermark image is embedded to the color host image by modifying high correlation elements of matrix , and an algorithm derived for the first time in this paper enables this process to be completed directly in the spatial domain without the real frequency domain conversion, which simplifies the operation process and reduces the computational complexity. Furthermore, an effective image correction algorithm is innovatively proposed, which detects and locates image vertices through Hough transform with strong anti-interference ability, corrects any quadrangle through perspective transform, and finally performs anti-aliasing processing on image edges based on the idea of fast approximate anti-aliasing algorithm. The significant contributions are summarized as: 1) the elements of LU factorization can be calculated directly in the spatial domain; 2) the geometrically attacked watermarked image can be corrected; 3) the fast approximate anti-aliasing is used to resist geometric attack. The experimental performances are shown as follows: 1) the average values of PSNR and SSIM are above 40 dB and 0.96 respectively, which indicates the invisibility of the proposed scheme using variable quantization steps is enough to meet the requirement of good image quality; 2) the average values of NC and BER are above 0.93 and about 0.1 respectively under different attacks, which emphasizes the proposed image correction algorithm can effectively deal with images under some geometric attacks with strong robustness; 3) the total time is about 0.14 s, which highlights the proposed fusion-domain algorithm can reduce nearly 63 % of the running time with high real-time feature.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the behavior of highly focused, radially coherent Dirichlet sources 高度聚焦、径向相干 Dirichlet 源的行为分析

Optics & Laser Technology Pub Date : 2024-02-15 DOI: 10.1016/j.optlastec.2024.110720

Rosario Martínez-Herrero, Marcos Aviñoá, Artur Carnicer

引用次数: 0

Damage mechanism in plasma evolution of nanosecond laser-induced damage of germanium sheets in air and vacuum 空气和真空中纳秒激光诱导锗片损伤的等离子体演化过程中的损伤机理

Optics & Laser Technology Pub Date : 2024-02-14 DOI: 10.1016/j.optlastec.2024.110689

Gangshuo Liu, Dengfeng Kuang

{"title":"Damage mechanism in plasma evolution of nanosecond laser-induced damage of germanium sheets in air and vacuum","authors":"Gangshuo Liu, Dengfeng Kuang","doi":"10.1016/j.optlastec.2024.110689","DOIUrl":"https://doi.org/10.1016/j.optlastec.2024.110689","url":null,"abstract":"Laser-induced damage of germanium (Ge) sheets plays a key role to explore the laser irradiation effect with the development of high-power laser and precision machining technology. However, the impact of plasma evolution on the damage mechanism is still a lack of detailed analysis for Ge sheet. Here, we investigate the change of the morphology and size of the plasma plume and compare it with the damage morphology of Ge sheets versus the laser pulse number in air and vacuum conditions. The plasma plume area reveals a gradual increase and then a slow decrease trend in the air and the final damage morphology is a shallow concavity. Instead, it reveals a fast rise and fall trend in the vacuum and the final morphology is a complete breakdown pit. The damage process of Ge sheet is divided into the initial damage, developmental damage, breakdown damage and stable damage according to the morphological changes of scattering light. The plasma shielding effect and thermal ablation play a more important role in formation of the damage morphology in the air, and the plasma shock wave and thermo-mechanical stress dominate the damage morphology in the vacuum. The significant contrasts and the combined experimental and theoretical works provide an insight into the laser irradiation effect and material degradation behavior, hence broaden the potential application of Ge sheets in laser micro/nano-fabrication.","PeriodicalId":19597,"journal":{"name":"Optics & Laser Technology","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139922702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0